CN220358875U - Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation - Google Patents

Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation Download PDF

Info

Publication number
CN220358875U
CN220358875U CN202321920779.XU CN202321920779U CN220358875U CN 220358875 U CN220358875 U CN 220358875U CN 202321920779 U CN202321920779 U CN 202321920779U CN 220358875 U CN220358875 U CN 220358875U
Authority
CN
China
Prior art keywords
bus
seamless switching
double
contactor
switching contactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202321920779.XU
Other languages
Chinese (zh)
Inventor
刘同利
何世阳
詹洪军
岳同耿日
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinxiang City Zhongda Electricity Co ltd
Original Assignee
Xinxiang City Zhongda Electricity Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xinxiang City Zhongda Electricity Co ltd filed Critical Xinxiang City Zhongda Electricity Co ltd
Priority to CN202321920779.XU priority Critical patent/CN220358875U/en
Application granted granted Critical
Publication of CN220358875U publication Critical patent/CN220358875U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model discloses a direct-current power supply system bus intelligent switching device with double charging and double storage of an electric power transformer substation, which belongs to the technical field of electric power and comprises a main loop: the seamless switching contactor I and the seamless switching contactor II are connected in parallel and then connected with the control switch in series, and two ends of the seamless switching contactor I and the seamless switching contactor II are connected to a rear terminal of the device by wiring to serve as access ends of the I-section direct current bus and the II-section direct current bus; and (3) a main control loop: the device rear connecting terminal is led in I way AC detection circuit and connects the solenoid of first relay, and the solenoid of seamless switching contactor I is connected to the main contact of first relay, and rear connecting terminal is led in II way AC detection circuit and is connected the solenoid of second relay, and the solenoid of seamless switching contactor II is connected to the main contact of second relay. In practical application, the bus intelligent switching device is connected with the system direct current bus Guan Binglian; when the alternating current bus of any charging device is in power failure, two sections of direct current power supplies are mutually standby, and reliable electric energy is provided for various protection/measurement and control devices of the power system.

Description

Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation
Technical Field
The utility model belongs to the technical field of power, and particularly relates to a direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for a power transformer substation.
Background
In the prior art, when alternating current is powered off, the under-voltage or disconnection of a battery causes the voltage loss of a protection device, the safe operation of the protection device of the power system cannot be ensured, and the operation risk of primary equipment is caused. Therefore, if a switching device can be designed, under the condition of any one section of two-way alternating current power failure, the two sections of direct current power supply bus-tie switching devices are automatically closed without gaps and are mutually standby, the voltage loss of the protection device caused by the undervoltage and the disconnection of a certain section of battery is prevented, and the safe operation of the protection device of the power system is ensured.
Disclosure of Invention
The utility model aims to provide a direct-current power supply system bus intelligent switching device with double charging and double storage for an electric power transformer substation, which comprises a section I direct-current bus, a seamless switching contactor I, a section I alternating-current detection circuit, a section I alternating-current power supply indicator lamp, a first relay, an auxiliary control switch, a section II direct-current bus, a seamless switching contactor II, a section II alternating-current detection circuit, a section II alternating-current power supply indicator lamp, a second relay, a device closing indicator lamp and a device standby indicator lamp; in practical application, the bus intelligent switching device is used in parallel with a system direct current bus switch; when the AC bus of the charging device of section I loses power or lacks the phase, the first relay is powered off, the seamless switching contactor I is conducted rapidly, the automatic bus connection device is closed and put into operation, and when the AC bus of the charging device of section II loses power or lacks the phase, the second relay is powered off, the seamless switching contactor II is conducted rapidly, and the automatic bus connection device is closed and put into operation. Under the power failure state of the alternating current bus of any section of charging device, the intelligent switching device of the direct current power supply system bus in double-charging double-storage configuration is automatically closed without gaps, so that two sections of direct current power supplies are mutually standby, and reliable electric energy is provided for various protection/measurement and control devices of the power system.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the intelligent bus-tie switching device of the double-charging double-storage direct-current power supply system of the power transformer substation comprises a bus-tie intelligent switching module arranged in a shell, wherein the bus-tie intelligent switching module comprises a main loop and a main control loop, and a wiring terminal is arranged at the rear part of the shell;
the main loop comprises a seamless switching contactor I, a seamless switching contactor II and an auxiliary control switch, wherein a normally closed contact I of the seamless switching contactor I and a normally closed contact II of the seamless switching contactor II are connected in parallel and then connected with the control switch in series, and two ends of the main loop are connected to a terminal at the rear part of the shell to serve as an access end of a section I direct current bus and a section II direct current bus;
the main control loop, the rear connecting terminal I of the shell is connected with the electromagnetic coil of the first relay by the I-path alternating current detection circuit, the main contact of the first relay is connected with the electromagnetic coil of the seamless switching contactor I, the rear connecting terminal II is connected with the electromagnetic coil of the second relay by the II-path alternating current detection circuit, and the main contact of the second relay is connected with the electromagnetic coil of the seamless switching contactor II;
when the AC bus of the charging device I or the charging device II fails, the corresponding seamless switching contactor I or the seamless switching contactor II is quickly conducted, and the automatic bus connection device is closed and put into operation.
Through the technical scheme, under the condition that the alternating current bus of any section of charging device is in a power failure state, the direct current power system bus intelligent switching device in double-charging double-storage configuration is automatically closed without gaps, so that two sections of direct current power supplies are mutually standby, and reliable electric energy is provided for various protection/measurement and control devices of the power system.
Further, the intelligent bus switching device further comprises a first isolation diode and a second isolation diode, wherein the first isolation diode is connected in series between the bus intelligent switching module and the I section of direct current bus, and the low-level end of the first isolation diode is connected with the bus intelligent switching module; and a second isolation diode is connected in series between the bus intelligent switching module and the II-section direct current bus, and the low-level end of the second isolation diode is connected with the bus intelligent switching module.
Through above-mentioned technical scheme, prevent effectively that automatic female device from closing in the twinkling of an eye, I section battery or II section battery charge current are too big in the twinkling of an eye, designed first isolation diode, second isolation diode in the practical application, first isolation diode, second isolation diode are high-power diode (1000V/250A). Namely, the two sections of feeder cabinets are connected into 1000V/250A high-power diodes in series, and the bus is connected into the two sections of direct-current feeder cabinets, so that the mutual influence of the high currents of the two sections of batteries can be prevented, and the original charging and discharging programs are unchanged.
Preferably, the device further comprises an I-path alternating current power supply indicator lamp connected to the I-path alternating current detection circuit, and a II-path alternating current indicator lamp connected to the II-path alternating current detection circuit.
Through above-mentioned technical scheme, when I section charging device AC bus loses electricity or lacks the looks, I way AC power supply pilot lamp goes out, and when II section charging device AC bus loses electricity or lacks looks, II way AC pilot lamp goes out, is convenient for observe I section charging device, II section charging device AC bus and whether breaks down.
Preferably, the device further comprises a bus connection input indicating circuit, wherein the bus connection input indicating circuit comprises a normally closed contact II of a seamless switching contactor I, a normally closed contact II of the seamless switching contactor II and a bus connection input indicating lamp, and the normally closed contact II of the seamless switching contactor I and the normally closed contact II of the seamless switching contactor II are connected in parallel and then connected in series with the bus connection input indicating lamp.
Preferably, the device further comprises a bus spare indication circuit, wherein the bus spare indication circuit comprises a normally open contact II of the seamless switching contactor I, a normally open contact II of the seamless switching contactor II and a bus spare indication lamp, and the normally open contact II of the seamless switching contactor I and the normally open contact II of the seamless switching contactor II are connected in parallel and then connected in series with the bus spare indication lamp.
Through the technical scheme, whether the intelligent switching device for the rhizoma anemarrhenae is put into use or not is convenient.
As the preferred implementation scheme, the device further comprises an insulation switching circuit, wherein the insulation switching circuit comprises a normally open contact I of a seamless switching contactor I and a normally open contact II of a seamless switching contactor II, the normally open contact I of the seamless switching contactor I and the normally open contact II of the seamless switching contactor II are connected in series and then connected with a signal opening terminal at the rear part of the device, and the insulation switching can be realized by connecting a grounding wire of one section of insulation detection device in series from the signal opening terminal.
Furthermore, in practical application, the bus intelligent switching module is used in parallel with the system direct current bus switch QS.
Compared with the prior art, the utility model has the beneficial effects that:
1. the original direct current bus-tie switch is reserved and runs in parallel with the automatic switching device, the battery discharging program is carried out according to the original specification, and the device is simultaneously suitable for intelligent uninterrupted switching between two sections of a direct current-48V communication power supply.
2. The device realizes the automatic switching of the primary connection of the first-stage direct current power supply and the second-stage direct current power supply through the parallel connection of the two paths of direct current switching circuits, and is free from arcing during switching, safe and reliable. The two sections of direct current systems independently run at ordinary times. When two paths of alternating current of the transformer substation are simultaneously powered off, two paths of switching devices of the switching device are simultaneously put into the transformer substation without gaps, and two sections of battery combining work is performed; when one group of storage batteries is disconnected, the direct current device and the protection device can be prevented from being influenced by the fault storage battery, and the direct current device and the protection device can continuously operate. When one section of two-way alternating current conversion gap and one switching device of the switching device which is powered off simultaneously are closed without gaps, the two sections of batteries are combined to work, the voltage difference of two groups of storage batteries is small, and the current difference is not large. When one section of alternating current is recovered to be normal, the corresponding switching device is controlled by the control circuit to realize quick cutting off after the charging module is stably started, so that the battery is prevented from being disconnected and overcharged.
3. The two sections of direct current stable switching and the stable operation of the system can be ensured as long as one group of storage batteries are normal, and the UPS uninterrupted power supply, the inverter, the DC-DC power supply and the monitoring unit are normally and uninterrupted operated.
4. After the bus is automatically closed, the bus is connected with the original manual bus switch signal in parallel through the dry contact circuit, and the working state is detected.
5. The two sections of feeder cabinets are connected into 1000V/250A high-power diodes in series, and the bus is connected into the two sections of direct-current feeder cabinets, so that the mutual influence of the high currents of the two sections of batteries is prevented. The original charge and discharge program is not changed.
Drawings
FIG. 1 is a schematic diagram of a typical application scenario of a bus intelligent switching device of the present utility model;
FIG. 2 is a schematic diagram of the main circuit inside the device;
FIG. 3 is a schematic diagram of the main control circuit within the device;
FIG. 4 is a schematic diagram of a parent link closed/standby status indication;
FIG. 5 is a schematic diagram of a bus-tie operating state signal;
FIG. 6 is a schematic diagram of an insulation switching signal;
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described in the following with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1-6, the direct current power supply system bus intelligent switching device with double charging and double storage of the power transformer substation comprises a bus intelligent switching module arranged in a shell, wherein the bus intelligent switching module comprises a main loop and a main control loop, and a wiring terminal is arranged at the rear part of the shell.
As shown in fig. 1, QS is an original design bus, and 1QS1 and 2QS1 are i and ii charging devices to a bus breaker. 1QS2 and 2QS2 are the charging devices of the first and second sections to the storage battery breaker.
Referring to fig. 1, the second output of the section i charging device is connected to the input of the section i battery, and charges (float charge) the section i battery when the ac circuit is normal.
Through the technical scheme, when the I-path alternating current circuit fails, the I-section storage battery supplies power for one section of load.
Referring to fig. 1, the second output of the section ii charging device is connected to the section ii battery input to charge the section ii battery (float charge).
Through the technical scheme, when the II-path alternating current circuit fails, the II-section storage battery supplies power for the two-section load.
In order to realize that the protection device of the power system can still be ensured to be safely carried out under the condition of any one-section two-way alternating current power failure, the embodiment adds the bus intelligent switching device, as shown in fig. 1, and the bus intelligent switching module and the system direct current bus switch QS are used in parallel during practical application.
The mother connection device works in the following way:
during normal operation, the bus-tie device and the direct-current bus-tie switch QS breaker are in an off state.
When the alternating current of the charging cabinet loses power or lacks the looks, charging device can stop the operation, and the female device of connecting is automatic closed fast, prevents that arbitrary section direct current busbar from appearing under-voltage, decompression because of the group battery trouble.
The first relay ZJ1 and the second relay ZJ2 are delay relays, and when the alternating current of the charging device is recovered to be normal, the charging device recovers to supply power, and the bus connection device is automatically disconnected after 30S of delay.
As shown in fig. 2, the main circuit inside the device comprises a seamless switching contactor i, a seamless switching contactor ii and an auxiliary control switch QS0, wherein a normally closed contact CZ1a of the seamless switching contactor icz 1 and a normally closed contact icz 2a of the seamless switching contactor icz 2 are connected in parallel and then connected in series with the auxiliary control switch QS0, and two ends of the main circuit are connected to a rear terminal of the shell to serve as the connecting ends of the section i direct current bus and the section ii direct current bus.
QS0 is a manual air switch, is an auxiliary contact and is normally in a closed state, and when one of a normally closed contact I CZ1a of a seamless switching contactor I CZ1 and a normally closed contact II CZ2a of a seamless switching contactor II CZ2 is closed, signals are output.
As shown in fig. 3, the main control circuit inside the device includes the solenoid of the seamless switching contactor icz 1, the solenoid of the seamless switching contactor icz 2, the solenoid of the first relay ZJ1, and the solenoid of the second relay ZJ 2.
The rear part of the shell of the device is provided with a plurality of wiring terminals, and the device mainly comprises wiring terminals I and II which are led into I paths of alternating current detection circuits and II paths of alternating current detection circuits.
The connecting terminal I is connected with the electromagnetic coil of the first relay ZJ1 by the I-path alternating current detection circuit, and the main contact of the first relay ZJ1 is connected with the electromagnetic coil of the seamless switching contactor I CZ 1.
The wiring terminal II is led into the II-path alternating current detection circuit to be connected with the electromagnetic coil of the second relay ZJ2, and the main contact of the second relay ZJ2 is connected with the electromagnetic coil of the seamless switching contactor II CZ 2.
Referring to fig. 2, when the ac bus of the i-stage charging device is powered off or phase-lost, the first relay ZJ1 is powered off, the normally closed contact icz 1a of the seamless switching contactor icz 1 is rapidly turned on, and the automatic bus connection device is closed and put into operation.
When the alternating-current bus of the II-stage charging device is in power failure or phase failure, the second relay ZJ2 is powered off, the normally closed contact ICZ 2a of the seamless switching contactor II CZ2 is rapidly conducted, and the automatic bus connection device is closed and put into operation.
Under the power failure state of the alternating current bus of any section of charging device, the intelligent switching device of the direct current power supply system bus in double-charging double-storage configuration is automatically closed without gaps, so that two sections of direct current power supplies are mutually standby, and reliable electric energy is provided for various protection/measurement and control devices of the power system.
As shown in fig. 1, a first isolation diode VD1 is connected in series between the bus intelligent switching module and the i-section dc bus in this embodiment, and a low-level end of the first isolation diode VD1 is connected with the bus intelligent switching module.
And a second isolation diode VD2 is connected in series between the bus intelligent switching module and the II-section direct current bus, and the low-level end of the second isolation diode VD2 is connected with the bus intelligent switching module.
Through above-mentioned technical scheme, effectively solved automatic female device closure in the twinkling of an eye, I section battery or II section battery charge current too big problem in the twinkling of an eye.
In practical applications, the first isolation diode VD1 and the second isolation diode VD2 are high power diodes (1000V/250A). Namely, the two sections of feeder cabinets are connected into 1000V/250A high-power diodes in series, and the bus is connected into the two sections of direct-current feeder cabinets, so that the mutual influence of the high currents of the two sections of batteries can be prevented, and the original charging and discharging programs are unchanged.
As a preferable technical scheme of the embodiment, as shown in fig. 3, the device further comprises an I-path alternating current power supply indicator lamp HR1 connected to the I-path alternating current detection circuit and a II-path alternating current indicator lamp HR2 connected to the II-path alternating current detection circuit.
When the corresponding alternating current bus is in a power failure state, the corresponding indicator lamp is turned off and is used for indicating whether the alternating current output circuit is powered.
In order to be convenient for know whether automatic female device put into use, this embodiment has still designed female closed pilot lamp HBR, female spare pilot lamp HBG that allies oneself with.
The specific technical scheme is as follows: after being connected in parallel, the normally-closed contact II CZ1b of the seamless switching contactor I CZ1 and the normally-closed contact II CZ2b of the seamless switching contactor II, namely CZ2, are connected in series with a bus connection input indicator lamp HBR; after the normally open contact II CZ1d of the seamless switching contactor I CZ1 and the normally open contact II CZ2d of the seamless switching contactor II CZ2 are connected in series, the seamless switching contactor I CZ1 and the normally open contact II CZ2 are connected in series with a bus spare indicator lamp HBG.
By adopting the technical scheme, when the I-path alternating current circuit and/or the II-path alternating current circuit is in power failure or phase failure, the I-path alternating current detection circuit and/or the II-path alternating current detection circuit is in a closed state, and the normally closed contact II CZ1b of the seamless switching contactor I CZ1 and/or the normally closed contact II CZ2b of the seamless switching contactor II CZ2 are/is in a closed state; normally open contact II CZ1d of seamless switching contactor I CZ1 and normally open contact II CZ2d of seamless switching contactor II CZ2 are in the open state, and the bus-tie closing indicator lamp HBR is on, and the bus-tie standby indicator lamp HBG is not on, so that the automatic bus-tie device is closed, and the automatic bus-tie device is put into use.
When two paths of alternating current output circuits are powered on, the normally closed contact II CZ1b of the seamless switching contactor I CZ1 and the normally closed contact II CZ2b of the seamless switching contactor II CZ2 are in an open state, the normally open contact II CZ1d of the seamless switching contactor I CZ1 and the normally open contact II CZ2d of the seamless switching contactor II CZ2 are in a closed state, at the moment, the bus connection closing indicator lamp HBR is not on, the bus connection standby indicator lamp HBG is on, and the automatic bus connection device is indicated to be opened and not put into use at the moment.
When the alternating current of the charging cabinet is in power failure or phase failure, the seamless switching contactor I CZ1 and/or the seamless switching contactor II CZ2 are/is powered off, and the automatic busbar device is automatically and rapidly closed.
Under any two-way AC power failure state, the two-way DC power supply bus-tie switching device (automatic bus-tie device) is automatically closed without clearance and is mutually standby, so that the voltage loss of the protection device caused by the undervoltage and disconnection of a certain section of battery is prevented, and the safe operation of the protection device of the power system is ensured.
In the embodiment, by arranging the delay relay, after alternating current is received, when alternating current of the charging device is recovered to be normal, the charging device recovers to supply power, the first relay ZJ1 and the second relay ZJ2 are closed in a delay manner, and after the direct current power supply is started normally, the master connection switching device is cut off in a delay manner; after the system is restored to an independent running state 30S, corresponding contacts of the first relay ZJ1 and the second relay ZJ2 are closed, the coils of the contactor I and the contactor II are seamlessly switched to obtain electricity, corresponding normally closed contacts are opened, normally open contacts are closed, and the busbar device is automatically opened.
The specific scheme is as follows:
the first delay power-off relay ZJ1 is connected to the main control loop of the I path, and the seamless switching contactor I CZ1 is connected in series with the main contact I of the first delay power-off relay ZJ1 and then connected in parallel with the first delay power-off relay ZJ 1.
And a second delay power-off relay ZJ2 is connected to the II main control loop, and the seamless switching contactor II CZ2 is connected in series with the main contact I of the second delay power-off relay ZJ2 and then connected in parallel with the second delay power-off relay ZJ 2.
The system also comprises an automatic bus-tie switch signal, wherein the automatic bus-tie switch signal and the original manual bus-tie switch signal are connected in parallel or directly transmitted to a public measurement and control device.
The bus connection working state signal circuit in this embodiment is: the device comprises an auxiliary switch QS0, a normally closed contact III CZ1c of a seamless switching contactor I CZ1 and a normally closed contact III CZ2c of a seamless switching contactor II CZ2, wherein the normally closed contact III CZ1c of the seamless switching contactor I CZ1 and the normally closed contact III CZ2c of the seamless switching contactor II CZ2 are connected in parallel, and are connected in series with the auxiliary switch QS0, and two ends of wiring are led out from the inside of the device and connected to a signal opening terminal at the rear part of the device.
After the bus is closed, the insulation detection device is likely to generate false alarm signals because the two sets of direct current systems are not the same company, in order to prevent insulation false alarm after the bus is closed, the embodiment designs an insulation switching circuit, and cuts off one section of insulation ground wire by using the insulation switching circuit, and the specific scheme is as follows:
the insulation switching circuit comprises a normally open contact I CZ1e of a seamless switching contactor I CZ1 and a normally open contact I CZ2e of a seamless switching contactor II CZ2, wherein after the normally open contact I CZ1e of the seamless switching contactor I CZ1 and the normally open contact I CZ2e of the seamless switching contactor II CZ2 are connected in series, wiring at two ends is led out from the inside of the device, a signal opening terminal at the rear part of the access device is connected, and insulation switching can be realized by connecting a grounding wire of one section of insulation detection device with the signal opening terminal in series.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the scope of the utility model, but rather to cover any modifications, equivalents, improvements or the like within the spirit and scope of the present utility model.

Claims (7)

1. The direct-current power supply system bus intelligent switching device with double charging and double storage functions of the power transformer substation is characterized by comprising a bus intelligent switching module arranged in a shell, wherein the bus intelligent switching module comprises a main loop and a main control loop, and a wiring terminal is arranged at the rear part of the shell;
the main loop comprises a seamless switching contactor I, a seamless switching contactor II and an auxiliary control switch, wherein a normally closed contact I of the seamless switching contactor I and a normally closed contact II of the seamless switching contactor II are connected in parallel and then connected with the control switch in series, and two ends of the main loop are connected to a terminal at the rear part of the shell to serve as an access end of a section I direct current bus and a section II direct current bus;
the main control loop, the rear connecting terminal I of the shell is connected with the electromagnetic coil of the first relay by the I-path alternating current detection circuit, the main contact of the first relay is connected with the electromagnetic coil of the seamless switching contactor I, the rear connecting terminal II is connected with the electromagnetic coil of the second relay by the II-path alternating current detection circuit, and the main contact of the second relay is connected with the electromagnetic coil of the seamless switching contactor II;
when the AC bus of the charging device I and/or the charging device II fails, the corresponding seamless switching contactor I and/or the seamless switching contactor II is/are quickly conducted, and the automatic bus connection device is closed and put into operation.
2. The direct-current power supply system bus intelligent switching device for double charging and double storing of the power transformer substation according to claim 1, further comprising a first isolation diode VD1 and a second isolation diode VD2;
a first isolation diode VD1 is connected in series between the bus intelligent switching module and the I section direct current bus, and the low-level end of the first isolation diode VD1 is connected with the bus intelligent switching module;
and a second isolation diode VD2 is connected in series between the bus intelligent switching module and the II-section direct current bus, and the low-level end of the second isolation diode VD2 is connected with the bus intelligent switching module.
3. The intelligent switching device for the bus tie of the double-charging double-storage direct-current power supply system of the power transformer substation according to claim 1, further comprising an I-path alternating-current power supply indicator lamp connected to an I-path alternating-current detection circuit and an II-path alternating-current indicator lamp connected to an II-path alternating-current detection circuit.
4. The direct-current power supply system bus-tie intelligent switching device for double charging and double storing of the power substation according to claim 1, further comprising a bus-tie input indicating circuit,
the bus connection input indicating circuit comprises a normally closed contact II of a seamless switching contactor I, a normally closed contact II of the seamless switching contactor II and a bus connection input indicating lamp, wherein the normally closed contact II of the seamless switching contactor I and the normally closed contact II of the seamless switching contactor II are connected in parallel and then connected with the bus connection input indicating lamp in series.
5. The direct-current power supply system bus intelligent switching device for double charging and double storing of the power transformer substation according to claim 1, further comprising a bus standby indication circuit,
the bus spare indication circuit comprises a normally open contact II of the seamless switching contactor I, a normally open contact II of the seamless switching contactor II and a bus spare indication lamp, wherein the normally open contact II of the seamless switching contactor I and the normally open contact II of the seamless switching contactor II are connected in parallel and then connected in series with the bus spare indication lamp.
6. The intelligent bus-tie switching device for the double-charging double-storage direct-current power supply system of the power transformer substation according to claim 1, further comprising an insulation switching circuit, wherein the insulation switching circuit comprises a normally open contact I of a seamless switching contactor I and a normally open contact II of a seamless switching contactor II, the normally open contact I of the seamless switching contactor I and the normally open contact II of the seamless switching contactor II are connected in series and then connected with a signal opening terminal at the rear part of the device, and the insulation switching can be realized by connecting a grounding wire of one section of insulation detection device from the signal opening terminal in series.
7. The intelligent switching device for the bus-tie of the double-charging double-storage direct-current power supply system of the power substation according to any one of claims 1 to 6, wherein the intelligent switching module for the bus-tie is used in parallel with a system direct-current bus-tie switch QS.
CN202321920779.XU 2023-07-20 2023-07-20 Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation Active CN220358875U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321920779.XU CN220358875U (en) 2023-07-20 2023-07-20 Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321920779.XU CN220358875U (en) 2023-07-20 2023-07-20 Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation

Publications (1)

Publication Number Publication Date
CN220358875U true CN220358875U (en) 2024-01-16

Family

ID=89481632

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321920779.XU Active CN220358875U (en) 2023-07-20 2023-07-20 Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation

Country Status (1)

Country Link
CN (1) CN220358875U (en)

Similar Documents

Publication Publication Date Title
CN201726132U (en) Double-power direct-current power supply system
WO2013062815A1 (en) System and method for multiple power supplies
CN116316518A (en) DC power supply and distribution system of unmanned ship
CN108063491B (en) Cooling control system of forced oil circulation air-cooled transformer
CN211556956U (en) High-reliability direct-current power supply for transformer substation
CN214176917U (en) Family energy storage cabinet with universality
CN220358875U (en) Direct-current power supply system bus-tie intelligent switching device with double charging and double storage functions for power transformer substation
CN112713611A (en) Grid-connected and off-grid automatic switching method, system and device, electronic equipment and electric cabinet
CN209170039U (en) A kind of automatic redundancy zero propagation switching system of two dc power supply
CN112398193A (en) Battery system protection circuit and charging and discharging method
CN217406169U (en) Switch protection circuit, switch box and energy storage assembly
CN216774297U (en) High-voltage box of medium-high voltage direct-hanging energy storage system
CN215221763U (en) Energy storage separating brake protection system
CN109274173A (en) A kind of dual redundant power supply system
CN116667482A (en) Battery device and power supply system using DC input
CN213341176U (en) Power plant direct current system combination control cabinet
CN114362159A (en) High-voltage box of medium-high voltage direct-hanging energy storage system
CN221633417U (en) Automatic recovery protection circuit and power supply system
CN216721006U (en) Automatic input device for open circuit protection of storage battery pack of transformer substation
CN219458664U (en) High-pressure tank and energy storage system
CN205304288U (en) Storage battery of direct current cabinet system switching device
CN218243096U (en) Power supply control loop of high-temperature reactor emergency bus and power system
CN114069569B (en) Method for reducing electric quantity loss of distribution box in fault state
CN218633432U (en) Power supply system and power supply equipment
CN213521411U (en) Intelligent removing system for faults of electrified railway contact network section

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant